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Macaulay2Doc :: Matrix _ Sequence

Matrix _ Sequence -- get entry of matrix

Synopsis

Description

All indexing in Macaulay2 is zero-based, so the indices start at zero.
i1 : M = matrix{{1,2,3},{0,5,6}}

o1 = | 1 2 3 |
     | 0 5 6 |

              2        3
o1 : Matrix ZZ  <--- ZZ
i2 : M_(1,2)

o2 = 6
The matrix may be a a mutable matrix too:
i3 : N = mutableMatrix M

o3 = | . .                           .                                                                                                                                                                                                                                                                                                         |
     | . 157536965545509947330002945 590111429682836384013088036458171334395674468796930757337849398472919452585384208662539386931218149464872271913301688699277944764406986154206712666260266815441169781765785530212311588450917298801407360965778114284633031808974337894981265289489944069245585130953413993019712628258006317166424489985 |

o3 : MutableMatrix
i4 : N_(1,0)

o4 = 0
Entries of mutable matrices can be changed:
i5 : N_(1,0) = 37

o5 = 37
i6 : N

o6 = | . .                           .                                                                                                                                                                                                                                                                                                         |
     | 1 157536965545699613085794305 590111429682836384013088036458171334395674468796930757337849398472919452585384208662539386931218149464872271913301688699277944758738210807840850327153835527720877602336910749140022606573061656359025254399556005300362615746442825625388434268827349991052906378224599132689383129712881718328668717057 |

o6 : MutableMatrix

See also